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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group	$ 8,000
Finite-lived intangible assets, net	$ 8,000
Amortization of intangible assets		$ 400	$ 400	$ 1,108	$ 1,108
Estimated future amortization expense, remainder of 2020		400		400
Estimated future amortization expense, 2021		$ 1,100		$ 1,100

X

- Definition

Regulatory milestone payment.

+ References

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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